Effects of an inhibitor of phosphoenolpyruvate carboxylase on photosynthesis of the terrestrial forms of amphibious Eleocharis species

Osamu Ueno, Ken Ishimaru

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

The leafless amphibious sedge Eleocharis vivipara develops culms with C4 traits and Kranz anatomy under terrestrial conditions, but develops culms with C3 traits and non-Kranz anatomy under submerged conditions. The culms of the terrestrial form have high C4 enzyme activities, while those of the submerged form have decreased C4 enzyme activities. The culms accumulate ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) in the mesophyll cells (MC) and the bundle sheath cells. The Rubisco in the MC may be responsible for the operation of the C3 pathway in the submerged form. To verify the presence of the C3 cycle in the MC, we examined the effects of 3,3-dichloro-2-(dihydroxyphosphinoylmethyl)-propenoate (DCDP), an inhibitor of phosphoenolpyruvate carboxylase (PEPC), on photosynthesis in culms of the terrestrial forms of E. vivipara and related amphibious species, E. baldwinii and E. retroflexa ssp. chaetaria. When 1 mM DCDP was fed via the transpiration stream to excised leaves, photosynthesis was inhibited completely in Fimbristylis dichotoma (C4 control), but by only 20% in potato (C3 control). In the terrestrial Eleocharis plants, the degree of inhibition of photosynthesis by DCDP was intermediate between those of the C4 and C3 plants, at 58-81%. These results suggest that photosynthesis under DCDP treatment in the terrestrial Eleocharis plants is due mainly to fixation of atmospheric CO2 by Rubisco and probably the C3 cycle in the MC. These features are reminiscent of those in C4-like plants. Differential effects of DCDP on photosynthesis of the 3 Eleocharis species are discussed in relation to differences in the degree of Rubisco accumulation and C3 activity in the MC.

本文言語英語
ページ(範囲)265-272
ページ数8
ジャーナルPhotosynthesis Research
71
3
DOI
出版ステータス出版済み - 6 26 2002

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Plant Science
  • Cell Biology

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